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The SMOR system has 3 independent setting tables, stored in non-volatile memory, so that information is
kept even when there is no auxiliary voltage. Only one setting table is active at a given time and this is the
table which the system uses to run the different functions included in it.
Of all the settings which exist for the SMOR unit, there are various groups (corresponding to General
Settings, Breaker, Active Table, Oscillography masks and Functions Permission) which are generic and are
therefore common to all the setting tables, while the rest of the settings are presented separately for each
table.
There is an "ACTIVE TABLE" setting which determines the settings table which is active at a given moment.
The settings table can be changed by means of up to 2 digital inputs, referred to as "TABLE SELECTION-0"
and "TABLE SELECTION-1" which allow up to 4 combinations from 0 to 3. To do this it is necessary to
configure (using GE-INTRO software) two inputs to have these meanings. For applications which require
less tables (up to 2) it is possible to use only one input.
The selected combination is obtained from the binary coding of the 2 inputs mentioned (see following table).
The 0-0 means selecting the table indicated in the "ACTIVE TABLE" setting, and numbers 0-1 to 1-1 select
tables 1 to 3 respectively (remembering that table 3 is always associated to the cold load pick-up, which has
maximum priority, see section 2.4.5).
Table Selection
NOTE: if the inputs are programmed and used, energizing them, this selection has priority over the "ACTIVE
TABLE" setting and the table which is in fact used is determined by the status of the digital inputs.
The SMOR system includes this function to avoid the unwanted operation of the overcurrent functions when
high current levels are produced when energizing a line which has been open for a long period of time.
This function is carried out by means of the automatic change to settings table number 3 when the breaker
has been open for a period of time greater than the programmed time for this function using the "t CHANGE
TABLE". The status of the breaker is detected by means of a 52/b contact on the breaker itself. The pick-up
values for table number 3 should be set to an appropriate value so that the protection system will not trip in a
cold load energization.
When the breaker closes (contact 52/b opens) it starts a timer whose threshold is set to the "warm-up" value
of the load. When this "t RETURN TABLE" expires the protection system changes automatically from
settings table number 3 to the settings table which is active at that moment. This time allows the normal line
load to be restored to its permanent value.
This function can be disabled by means of the "COLD LOAD PICK-UP PERMISSION" setting ("CLP
PERMISSION").
Table Selection
INPUT-1
0
0
1
1
GEK-105593C
INPUT-0
0
1
0
1
21
2.4.4. TABLES OF SETTINGS
Active Table
Selected by setting
1
2
3
2.4.5. COLD LOAD PICK-UP.
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